Models can be used to represent a process or show the composition of a material. For example, a model of an atom shows what matter is made out of and how it is composed. Scientists have been using models since ancient times to help explain the world around us. Models help you understand something that you cannot see or touch by making it visible or giving it a form that you can physically explore. In this case, the model lets scientists explore atoms without having to use an electron microscope. This method provides them with up-close images from different angles so they can learn about their properties in detail.
plsss anwer my questions in the picture
Answer:
17) b
18) c
19) c
20) c
21) b
22) D
23) b
24) b
25) a
26)?
27) D
28) b
29) D
30) c
physical and chemical changes occur in digestion. What is an example of an physical change in digestion
teeth chewing food
acid mixing with food
saliva mixing with food
enzymes mixing with food
Answer:
teeth chewing food
Explanation:
When teeth chews food it change its state from hard solid to fine substance that can be easily digested by the body i guess
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A mining company is looking for ways to save money on the process they use to discover new mineral resources while also reducing the impact that the mining process has on the environment.
Which improved technology would
best achieve this goal?
O fracking
O drilling technology
O extraction technology
O geological Surveying
Answer:
extraction technology.....
*1. Which statement about the temperature of a phase changes in electrostatic forces holding the molecules is correct?
A. The temperatures of which a substance changes phases is dependent of the size of the molecules in the substance.
B. The strength of the forces between molecules in a substance depends on the number of filled electron shells.
C. The temperatures at which a substance changes phases indicate the relative strength of the forces between molecules in the substance.
D. The strength of the forces between molecules in a substance is the strongest at higher temperatures.
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*2. Which list shows the phases of matter in order from strongest collective electrostatic forces to weakest collective electrostatic forces?
A. Gas, solid, liquid
B. Gas, liquid, solid
C. Liquid, solid gas
D. Solid, liquid, gas
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*3. Which change happens when water boils?
A. The forces between water molecules become stronger, and the bonds between atoms in the water remain unchanged.
B. The forces between water molecules are unchanged, and the bonds between the atoms in a water break.
C. The force is between water molecules in the bonds between the atoms in the water molecules break.
D. The forces between water molecules break, and the bonds between the atoms in water are unchanged.
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*4. A sample of calcium carbonate is cooled. Which change happens to the molecules of calcium carbonate in the sample?
A. The forces weaken, and the molecules move around.
B. The molecules break apart and then form stronger forces.
C. The forces strengthen, and the molecule structure becomes more rigid.
D. The molecules vibrate more and weaken the forces.
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*5. The boiling point of acetone is lower than the boiling point of ethanol. Based on this information, which conclusion can be drawn about the two substances?
A. The intramolecular bonds in acetone are stronger than the intramolecular bonds in ethanol.
B. The intermolecular forces in ethanol are stronger than the intermolecular forces in acetone.
C. The intramolecular bonds in ethanol are stronger than the intramolecular bonds in acetone.
D. The intermolecular forces in acetone are stronger than the intermolecular forces in ethanol.
Answer:
see below
Explanation:
1. The temperatures at which a substance changes phases indicate the relative strength of the forces between molecules in the substance.
2. solid, liquid, gas
3. The forces between water molecules break, and the bonds between the atoms in water are unchanged.
4. The forces strengthen, and the molecule structure becomes more rigid.
5. The intermolecular forces in ethanol are stronger than the intermolecular forces in acetone.
The the degree of intermolecular interaction between molecules determines the magnitude of boiling point of the substance.
During phase change, a substance moves from one state of matter to another. The temperature at which a phase change occurs is determined by the strength of the forces between molecules in the substance. The relative magnitude of intermolecular forces between molecules in different states of matter is solids > liquids > gases.
During boiling, energy is imparted to the molecules of a liquid. When this occurs, the forces between water molecules break, and the bonds between the atoms in water are unchanged.
We must recall that the molecules of a substance are in constant random motion. The average kinetic energy of molecules is proportional to temperature. As a sample of calcium carbonate is cooled, the forces between molecules strengthen, and the molecule structure becomes more rigid.
The magnitude of intermolecular interaction affects the boiling point of a liquid. The stronger the magnitude of intermolecular interaction,the higher the boiling point. As such, ethanol having hydrogen bonds between its molecules has a higher boiling point than acetone which only posses weaker dipole - dipole interactions.
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what are aliphatic alcohols and what differentes it from other alcohols
Answer: Lipids are one of the important nutrients needed by the body to supply energy and essential fatty acids required by the organism. Solid alcohols are a class of steroids, which are steroids containing hydroxyl groups. Lipids is a general term for oils, fats and lipids. 2, the characteristics are different: fat consists of c, h, o three elements. Fats are triacylglycerides made up of glycerol and fatty acids.
You have 2.567 grams of water. What is the volume of water(use correct units)
Answer:
2.567 mL
Explanation:
An aqueous solution of a vanadium chloride salt is electrolyzed by a current of 3.00 A passing through the solution for 60.0 min. If 5.70 g of vanadium is produced at the cathode during this time, what is the likely formula unit for the vanadium salt
From the information in the question, the formula unit of the salt is given as VCl.
The quantity of charge produced is obtained from;
Q = It
I = current (3 A), t = time (3600 s)
Q = 3 A × 3600 s
Q = 10800 C
Now we need to find the number of electrons transferred as follows;
51 g of Vanadium is deposited by 96500n C
5.70 g is deposited by 10800 C
5.70 × 96500n = 51 × 10800
n = 51 × 10800/5.70 × 96500
n = 1
The formula of the salt is VCl.
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Write a balanced chemical equation for the complete combustion of methanol, ethanol, propanol, butanol and paraffin wax(C25H52). This information will be needed for the experiment. Transfer the answer to the data sheets also. (10 pts)
Answer:
Explanation:
1. Methanol:
CH3OH + O2 ---> CO2 + 2H2O
2. Ethanol:
C2H5OH + 3O2 ----> 2CO2 + 3H2O
3. Propanol:
2C3H7OH + 9O2 ------> 6CO2 + 8H2O
4. Butanol
C4H9OH + 6O2 -------> 4CO2 + 5H2O
5. Paraffin Wax:
C25H52 + 38O2 ----> 25CO2 + 26H2O
Pick the correct answer!
1. Why does the octet rule apply primarily to main-group elements, not to transition metals?
a. The octet rule states that main-group elements tend to react so that they attain a halogen electron configuration.
b. The octet rule states that transition metal-group elements tend to react so that they attain a noble gas electron configuration.
c. The octet rule states that main-group elements tend to react so that they attain a ionic electron configuration. d. The octet rule states that main-group elements tend to react so that they attain a noble gas electron configuration.
Answer:
I think it would be b. The octet rule states that transition metal group elements tend to react so that they attain a noble gas electron configuration.
What is velocity?
0000000
Answer:
Velocity is the speed in which the light is traveling
Explanation:
Ocean water Choose one: A. is less dense than freshwater. B. salinity decreases as seawater evaporates. C. contains dissolved salts, like halite and gypsum. D. has an average salinity of 35%.
Answer: the answer is C
Explanation:
Ocean water contains dissolved salts, like halite and gypsum. The correct option is C.
What is the ocean?The ocean is the salty water that covers an area of 70.08% of the total surface. It is a large body of water that covers the entire earth. There are seven oceans present with different names, and they are connected with each other. The ocean is one of the traveling routes for traveling and exporting and import of products.
The average salinity of the ocean is 3.5%. It contains salts, halite, and gypsum-like minerals and substances.
Thus, the correct option is C. contains dissolved salts, like halite and gypsum.
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What kind of wave causes particles in rocks to move at right angles to the direction of the wave
Answer:
Secondary waves
A type of seismic body wave in which rock particles vibrate at right angles to the direction of wave travel. Secondary waves cause the rocks they pass through to change in shape.
Which of the four is least like the other three? A)Platinum B)Ivory C)Silver D)Gold
Answer:
B) Ivory
Explanation:
Ivory is a hard, white material from the tusks and teeth of animals, that consists mainly of dentine, one of the physical structures of teeth and tusks.
Platinum, Silver, and Gold are precious metals, meaning they are rare metallic chemical elements of high economic value, shiny, hard, strong with high melting points
Ivory is regarded as the least of the options. Ivory consists of dentine and
are usually found in the tusks and teeth of animals such as elephants. They
however don't have much value as the other metals in the options.
Precious metals include the following:
PlatinumSilverGoldThey are used for ornamental purposes. They are usually mined and refined
to produce a variety of objects.
Their use are however legal and they are expensive which makes the Ivory
the least out of the options provided.
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Under an O2(g) pressure of 1.00 atm, 28.31 mL of O2(g) dissolves in 1.00 L H2O at 25 °C. What will be the molarity of O2 in the saturated solution at 25 °C when the O2 pressure is 4.47 atm? Assume that the solution volume remains at 1.00 L.
In the first case, the molarity of oxygen gas is 0.0012 mol/L. In the second case, the molarity of oxygen gas is 0.0052 mol/L .
We have to obtain the number of moles of oxygen as follows;
P = 1.00 atm
V = 28.31 mL or 0.02831 L
n = ?
R = 0.082 atm LK-1mol-1
T = 25 °C + 273 = 298 K
n = PV/RT
n= 1.00 atm × 0.02831 L/ 0.082 atm LK-1mol-1 × 298 K
n = 0.0012 moles
Molarity = Number of moles/Volume = 0.0012 moles/1.00 L = 0.0012 mol/L
For the second case;
P = 4.47 atm
V = 28.31 mL or 0.02831 L
n = ?
R = 0.082 atm LK-1mol-1
T = 25 °C + 273 = 298 K
n = PV/RT
n = 4.47 atm × 0.02831 L/0.082 atm LK-1mol-1 × 298 K
n = 0.1265/24.436
n = 0.0052 moles
Molarity of oxygen = 0.0052 moles/1.00 L = 0.0052 mol/L
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Which bond is the strongest? A) H–Br C) H–F B) H–Cl D) H–I
Question 10
What is this structure name?
CH3 – CH2 - CH
CH – CH – CH2 - CH2
CH; CH – CH, -CH,
СН
CH3
cosh(-cosh(-CH
Simplify the expression using the symmetry of hyperbolic functions
cosh(cosh(CH))
Simplify the expression using the symmetry of hyperbolic functions
the answer is cosh(cosh(CH))
balanced equation for the reaction between gallium and nitric acid. any spammers will be reported only correct answers
Answer:
Ga + 6HNO3 → Ga(NO3)3 + 3NO2 + 3H2O
Explanation:
Gallium has an ionic charge of 3+, so three nitrate ions are needed to balance it out.
What is the reaction between CCl4 and H2O?
Answer:
At temperatures > 400 °C, CCl4 reacts with H2O over a MgO catalyst to yield HCl and CO2.
Which best describes the energy change that takes place during deposition?
Heat energy released by the substance
Heat energy is maintained by the substance
Heat energy is slowly gained by the substance
Heat energy is quickly absorbed by the substance
Answer:
heat energy released by the substance
The energy change that takes place during deposition is that heat energy is released by the substance. This statement is true about deposition.
Deposition is a phase transition that occurs when a gas is converted directly to a solid without passing through the liquid state. During deposition, energy is released by the gas particles and absorbed by the surface, resulting in a decrease in the energy of the gas particles and an increase in the energy of the surface particles.As a result, the substance releases heat energy as it changes from a gas state to a solid state.
Therefore, the correct option is:Heat energy released by the substance.
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One mole of what substance contains a total of 6.02x10^23
Answer:
oxygen
Explanation:
One mole of atoms of oxygen has a mass of 16 g, as 16 is the atomic weight of oxygen, and contains 6.02 X 1023 atoms of oxygen.
The diagram shows the box for an element in the periodic table. Whats is the atomic mass of the element shown?
Explanation:
option C is correct!
hope this answer helps you dear!
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The Correct choice is ~ C
Atomic mass of Sulfur (S) is 32.1 u
Which is the correct name for the covalent compound that
contains five oxygen atoms and two phosphorus atoms?
a Diphosphorus pentoxide
b Pentaoxygen diphosphide
C Phosphorus oxide
d Pentaoxygen diphosphorus
The correct name for the covalent compound that contains five oxygen atoms and two phosphorus atoms is Diphosphorus pentoxide.
The covalent compound has a combination of phosphorus and oxygen.
The oxygen atoms is 5 and the phosphorus atoms is 2.
Therefore, the combination can be represented chemically as follows:
P₂O₅The standard name for this compound is Diphosphorus pentoxide.
The prefix di simply means phosphorus is 2 atoms.
The pent indicates 5 atoms of oxygen.
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perdon no se es que es para que me dé ingreso
Why were people from lower castes drawn to Buddhism?
O The Buddhist belief in equality appealed to them.
O Buddhism allowed people from all castes to participate.
People from the lower castes were born into Buddhism.
O People in the lower castes wanted to choose their own religi
Answer:
During the Maurya empire, the Indian culture and way of life were deeply influenced by Buddhism. Buddhism appealed to people of lower castes because it emphasized individuals' path to enlightenment and salvation, which could be attained in this life.
Explanation:
What is heat of reaction? Tell me In a short description?
Answer:
The Heat of Reaction (also known and Enthalpy of Reaction) is the change in the enthalpy of a chemical reaction that occurs at a constant pressure. It is a thermodynamic unit of measurement useful for calculating the amount of energy per mole either released or produced in a reaction.
why the back torn of camel is important?
The back torn of Camel is important because it acts as a storage facility for
fats.
Camels are found in desert regions where there is scarcity of
Food WaterThis makes the food it eats to get stored at the back in the hump
region as fats so as to enable it survive long periods of unavailability of food.
The fats are gradually metabolized into nutrients which is used by the body
cells to ensure adequate energy availability and optimal survival.
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methane the principal component of natural gas is used for heating the cooking the combustion process is
Answer:
CH4 + O2 = CO2 + 2H2O
Explanation:
carbon dioxide and water is given off
How many grams of oxygen will react with 2.0 grams of iron II sulfide?
Answer:
How many grams Iron(II) Sulfide in 1 mol? The answer is 87.91. We assume you are converting between grams Iron(II) Sulfide and mole. You can view more details on each measurement unit: molecular weight of Iron(II) Sulfide or mol The molecular formula for Iron(II) Sulfide is FeS. The SI base unit for amount of substance is the mole.
Explanation:
Fruit juice when boiled taste sweeter than sucrose because
Answer :see explanation
Explanation:
the sweet carbohydrate in fruit is not sucrose , it is fructose.
and fructose tastes sweeter than sucrose
fructose and glucose minus water equals sucrose
and fructose is sweeter than glucose
Zingerone, one of the flavor molecules in ginger,
contains only C, H, and O. Combustion of 10.0 g
of zingerone produces 24.91 g of CO2 and
6.522 g of H20. Determine the molar mass of the
compound if it is between 150.0 and 220.0 g/
mol. Provide an answer to four significant
figures.
The molecular formula of the compound is C12H15O3 hence the molar mass of the compound is 207 g/mol.
We need to obtain the number of moles of carbon, hydrogen and oxygen in the compound;
Carbon = 24.91 g/44g/mol × 1 mole of carbon = 0.566 moles
Mass of carbon = 0.566 moles × 12 g/mol = 6.792 g
Number of moles of hydrogen = 6.522 g/18 g/mol × 2 moles = 0.725 moles
Mass of hydrogen = 0.725 moles × 1 g/mol = 0.725 g
Mass of oxygen = 10 - (6.792 g + 0.725 g) = 2.483 g
Number of moles of oxygen = 2.483 g/16 g/mol = 0.155 moles
Now we must divide through by the lowest number of moles;
C - 0.566/0.155 H - 0.725/0.155 O - 0.155/0.155
C - 4 H - 5 O - 1
The simplest formula is C4H5O Recall that the molar mass of the compound lies between 150.0 and 220.0 g/mol
4(12) + 5(1) + 16 = 69
Hence; n = 3 and the molecular formula of the compound is C12H15O3
The molar mass of the compound is; 12(12) + 15(1) + 3(16) = 207 g/mol
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